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State and fault estimation method of dead zone sandwich system

A fault estimation and sandwich technology, applied in general control systems, control/regulation systems, instruments, etc., can solve problems such as undiscovered dead zone sandwich systems, estimation error divergence, and no estimated system failures

Active Publication Date: 2021-04-30
GUILIN UNIV OF ELECTRONIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in actual systems, faults are often unavoidable. Due to the existence of faults, the state estimation of the system will produce certain disturbances, and even cause the estimation error to diverge, that is, the state of the system cannot be estimated.
The invention also does not estimate system failures since failure effects are ignored
So far, no patents and literatures have been found on dead-zone sandwich systems that simultaneously estimate state and faults

Method used

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  • State and fault estimation method of dead zone sandwich system
  • State and fault estimation method of dead zone sandwich system
  • State and fault estimation method of dead zone sandwich system

Examples

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Embodiment

[0102] A state and fault estimation method for a dead zone sandwich system, comprising the following steps:

[0103] 1) Using the principle of separation of key terms and switching functions, construct a non-smooth state-space equation that can accurately describe the gap sandwich system with faults. Due to the nonlinear characteristics of the dead zone, the size of the output is only related to the size of the input at the current moment. Regardless of the input and output at the previous moment, the state space equation of the system is established for the dead zone sandwich system with actuator faults, as follows:

[0104] Such as figure 1 As shown, the figure shows a dead zone sandwich system with actuator faults, where u(k) and y(k) are measurable input and output variables respectively, and v 1 (k) and v 2 (k) is an unmeasured intermediate variable, L 1 represents the pre-Ray linear subsystem, L 2 Represents the post-Ray linear subsystem, D 1 and D 2 is the width o...

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Abstract

The invention discloses a state and fault estimation method of a dead zone sandwich system. Aiming at the problem that intermediate variables of a dead-zone nonlinear and non-smooth sandwich system cannot be measured, the invention discloses a method for accurately and quickly estimating the state and fault of the system by switching a proportional-integral observer. The method comprises the steps: employing a key separation principle and a switching function to construct a non-smooth state space equation capable of accurately describing a dead zone sandwich system; according to the constructed non-smooth state space equation, constructing the SPIO capable of being switched along with the change of a system working interval; by analyzing the estimation error of the observer, providing the convergence condition of the observer, and providing a mathematical proof for the convergence theorem of the observer. The method has the advantages that the switching function is introduced into the observer, and compared with a traditional proportional-integral observer, the observer adopting the method can more accurately estimate the state and the fault of the system at the same time.

Description

technical field [0001] The invention relates to the technical field of nonlinear system state estimation, in particular to a state and fault estimation method of a dead zone sandwich system. Background technique [0002] A class of dead zone sandwich systems exists in industry. The intermediate variables of this type of system cannot be measured or the measurement cost is very high, but if the intermediate state cannot be obtained, most state feedback control methods cannot be performed, because the state value of the system must be accurately known in state feedback control. At present, the most effective way to obtain the unknown state value is to design an observer, which uses the input and output variables of the system to estimate the unknown state of the system. [0003] Chinese patent CN105204332A discloses a non-smooth observer-based method for estimating the state of a composite sandwich system with dead zones and hysteresis. The invention estimates the state of th...

Claims

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Application Information

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IPC IPC(8): G05B13/04
CPCG05B13/042
Inventor 周祖鹏刘旭锋
Owner GUILIN UNIV OF ELECTRONIC TECH
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